Pallet for cement-pipe machines.



F. L.'DREW.

PALLET FOR CEMENT PIPE MACHINES.

APPLICATION FILED IAN. 4. I9I6.

Pw m w m Patented Nov. 14, 1916.

Y FRANK L. DREW, 0F MANHATTAN BEAGH, CALIFORNIA.

PALLET FOB CEMENT-PIPE MACHINES.

Specification of Letters Patent.

- Patented Nov. 14, 1916.

Application tiled January 4, 1916. Serial No. 70,203.

To all whom z't may concern.'

Be it known that I, FRANK L. DREW, a citizen of the United States, residing at Manhattan Beach, in the county of Los Angeles vand State of California, have invented new and useful Improvements in Pallets for Cement-Pipe Machines, -of which the following is a specification.

My invention relates to an apparatus for making cement pipe such as sewer pipe and in particular to improvements in the pallets, as the molds shaping the ends of the cement pipes are called.

In the manufacture of cement sewer pipe, the cement material is pressed or packed into shape by means of a revolving packer which is` mounted on a revolving vertical shaft, which travels upward in a direction of its axis. The revolving packer blades press or pack the cement material against a mold jacket which shapes the outer face of the pipe, while the inner face is shaped by said packer. The pallets constitutethe molds ,for the upper and lower ends of the pipe, the pipe being built upon thelower pallet.

It has been found that on account of the excessive friction between the packer and the pallets due to the cement and sand getting in between these members, lthe inner lateral face of thevpallet is rapidly wornv away, so that each successive pipe built upon the pallet is of slightly larger internal diameter than the preceding pipe. It therefore becomes necessary to replace the pallets at frequent intervals.

It is an object of this invention to construct pallets each provided with a detachable wearing ring of cast iron which forms the inner lateral side thereof. These rings may be removed and replaced by new ones at a nominal cost, thereby prolonging the life ofthe pallets indefinitely.

lVith these and other objects in view which will appear as the description proceeds, my invention consists in the construction and arrangement of parts hereinafter described and claimed. V

In the accompanying drawings which form a part of this specication, I have illustrated a preferred embodiment of my invention and in which:

Figure 1 is a vertical cross section of a cement sewer pipe which has been shaped in its mold, said view also showing the revolving packer and trowel which are used in shaping the pipe. Figs. 2 and 3 are sectional views on an enlarged scale of the lower and upper pallets respectively, showingl the detachable wearing rings. Fig. 4 isa top plan '.v-iew of the packer and trowel. F1g.'5 isa horizontal section taken on line 5 5 Fig. 1. Fig. 6 is a perspective view of the detachable Wearing ring with its key plate, removed from the pallet.

The' mold in which the cement sewer pipe A is' formed'comprises a lower pallet 10 and an upper pallet 11. The lower pallet 10 is supported on any suitable frame (not shown). A cylindrical hinged jacket 12 is detachably secured to the lower and upper pallets 10'and 11. The cementitious material used for making the pipe is fed by a suitable mechanism (not shown) from above and is pressed or packed into shape against the jacket- 12 by means of arevolvmg packer 13 which I have shown as consisting of three wing members. rotating in the direction indicated by the arrow'in Fig. 4. A revolving vertical shaft 14i's rigidly secured to said packer. Below said packer a cylindrical trowel member 15 of a diameter to correspond to the internal diameter of the cement pipe A is fast on a shaft 14 and serves to smooth the inner face of said pipe.

The vertical shaft 14 moves gradually in the direc-tion of its longitudinal axis as `indicated by the arrow-in Fig. 1, so that beginning with the lower pallet 10, the cement pipe is gradually built up extending between the pallets and resting on the lower pallet 10 as will be understood.

The elements thus far described are well known in the art and form no part of my invention, which relates solely to improvements in the pallets.

Referring to the lower pallet 10, the inner lateral face thereof is provided with. a circross section. A flat metal ring, preferably of cast iron 17, which Iis split to form a transverse slot at 18 is of a thickness to fit in the circular groove 16. It should be noted that the width of the ring 17 is greater .cular groove or channel 16, rectangular in than the width of the lower face 19 of the circular groove 16 in the pallet 10, so that the inner portion of the metal ring 17 will project inwardly beyond the inner face of the pallet 10 to form an annular shoulder. The metal ring is sprung into place by forcing .the ends forming the slot 18 together, thus decreasing the diameter of sa1d rmg to enable the operator to insert the same in place within the circular groove 16. When in position, the ring is allowed to expand, forming a tight lit with said groove and a metal .key plate 20 isinserted in slot 18 to lock the ring in position. j

The upper pallet 11 is provided with a circular groove 16 of the same size and shape as the groove 16 in the lower pallet 10, and the ring 17 is inserted therein in the same manner as described in connection with the lower pallet.

Fromv the foregoing description, the operation of the improved pallet will be obvious. The cement pipe is built on the lower pallet, by means of the revolving packet 13 and the -f trowel l5 as will be` understood. When the detachable wearing ring 17 has been excessively worn, the same may be easily removed and a new one put in place.

While ll have shown a packing ring and a circular groove in which the same ts, rectangular in cross section, it will .be understood that l do not conne myself to this specific detail, as changes therein may be made by those skilled in the art without departing from the spirit of my invention as defined in the appended claims.

I claim: l

1. In an apparatus for making cement pipe, the combination of a pallet having a horizontal groove on` its inner face, said groovebeing rectangular in cross section, a split wearing metal ring detachably mounted in said groove, said ring forming an annular shoulder projecting inwardly from Vsaid pallet and a key member inserted in groove being rectangular in cross section and a split metal ring detachably mounted in said groove, said ring forming an annular shoulder projecting inwardly. from said pallet. f

3. In an apparatus for making cement pipe, the combination of a pallet having a horizontal groove on its inner face and a split wearing metal ring detachably mounted in said groove, said ring forming an annular shoulder projecting inwardly from said pallet.

4. In an apparatus for making cement pipe, the combination of a pallet having an inwardly projecting annular shoulder formed integral therewith, and a detachable split Wearing metal ring mounted thereon.

ln testimony whereof l have signed my name to this specification.

FRANK L. DREW. 

